package com.atguigu.daijia.common.util;

import java.security.MessageDigest;

public class MD5Util {

	public static String MD5Encode(String origin, String charsetname) {    
        String resultString = null;    
        try {    
            resultString = new String(origin);    
            MessageDigest md = MessageDigest.getInstance("MD5");    
            if (charsetname == null || "".equals(charsetname))    
                resultString = byteArrayToHexString(md.digest(resultString    
                        .getBytes()));    
            else    
                resultString = byteArrayToHexString(md.digest(resultString    
                        .getBytes(charsetname)));    
        } catch (Exception exception) {    
        }    
        return resultString;    
    }    
	
	private static String byteArrayToHexString(byte b[]) {    
        StringBuffer resultSb = new StringBuffer();    
        for (int i = 0; i < b.length; i++)    
            resultSb.append(byteToHexString(b[i]));    
    
        return resultSb.toString();    
    }    
    
    private static String byteToHexString(byte b) {    
        int n = b;    
        if (n < 0)    
            n += 256;    
        int d1 = n / 16;    
        int d2 = n % 16;    
        return hexDigits[d1] + hexDigits[d2];    
    }    
    
    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",    
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };    
}
